Two batteries of emf $\varepsilon_1$ and $\varepsilon_2$ (where $\varepsilon_2 > \varepsilon_1$) and internal resistances $r_1$ and $r_2$ respectively are connected in parallel as shown.

• A
  $\varepsilon_{eq}$ is independent of internal resistances $r_1$ and $r_2$.
• B
  The equivalent emf $\varepsilon_{eq}$ is smaller than $\varepsilon_1$.
• C
  The equivalent emf is given by $\varepsilon_{eq} = \varepsilon_1 + \varepsilon_2$.
• D
  The equivalent emf $\varepsilon_{eq}$ of the two cells is between $\varepsilon_1$ and $\varepsilon_2$,i.e.,$\varepsilon_1 < \varepsilon_{eq} < \varepsilon_2$.